于泉洲, 周蕾, 王绍强, 孙雷刚, 刘煜杰, 汤庆新, 曹建荣. 基于EO-1 Hyperion的中国典型森林冠层高光谱特征分析*[J]. 云南大学学报(自然科学版), 2018, 40(5): 947-954. doi: 10.7540/j.ynu.20170710
引用本文: 于泉洲, 周蕾, 王绍强, 孙雷刚, 刘煜杰, 汤庆新, 曹建荣. 基于EO-1 Hyperion的中国典型森林冠层高光谱特征分析*[J]. 云南大学学报(自然科学版), 2018, 40(5): 947-954. doi: 10.7540/j.ynu.20170710
YU Quan-zhou, ZHOU Lei, WANG Shao-qiang, SUN Lei-gang, LIU Yu-jie, TANG Qing-xin, CAO Jian-rong. An analysis on the spectrum characteristics of Chinese typical forest canopy in growing season based on EO-1 Hyperion images[J]. Journal of Yunnan University: Natural Sciences Edition, 2018, 40(5): 947-954. DOI: 10.7540/j.ynu.20170710
Citation: YU Quan-zhou, ZHOU Lei, WANG Shao-qiang, SUN Lei-gang, LIU Yu-jie, TANG Qing-xin, CAO Jian-rong. An analysis on the spectrum characteristics of Chinese typical forest canopy in growing season based on EO-1 Hyperion images[J]. Journal of Yunnan University: Natural Sciences Edition, 2018, 40(5): 947-954. DOI: 10.7540/j.ynu.20170710

基于EO-1 Hyperion的中国典型森林冠层高光谱特征分析*

An analysis on the spectrum characteristics of Chinese typical forest canopy in growing season based on EO-1 Hyperion images

  • 摘要: 由于冠层结构和功能性状的差异,不同森林表现出不同的光谱特征.分析不同森林冠层的光谱特征差异可以为精确森林分类和冠层参数反演提供依据.因此,理解我国典型森林类型的高光谱特征将有助于提高我国森林分类以及森林理化参数反演的精度.研究以中国生态网络中的长白山、神农架、千烟洲和鼎湖山4个典型森林站点为研究对象,利用EO-1 Hyperion星载高光谱数据提取4种森林像元尺度上的反射光谱曲线,并进行一阶微分变换,同时计算多种遥感光谱指数,定量分析其光谱特征差异.结果表明:①神农架阔叶混交森林光谱反射率在整个光谱范围内显著高于其他3种森林类型.千烟洲针叶混交森林在整个光谱范围内表现出较低的反射特征.长白山和鼎湖山森林的反射率居中.②4种森林的红边斜率存在显著差异.神农架森林的红边斜率最高,暗示了其冠层叶绿素含量高,健康状况最好.千烟洲的红边位置相比其他3种森林有所红移,红边位于720nm左右.③遥感指数方面,神农架阔叶林具有较高的归一化氮指数(NDNI),千烟洲马尾松湿地松为主的针叶林具有较低的NDNI,反映出树种间真实的叶片氮浓度差异.另外,由于森林覆盖度较高,增强型植被指数(EVI)比归一化植被指数(NDVI)更能够指示森林类型之间绿度和覆盖度的变化.研究对于我国森林参数的遥感反演和森林类型高精度分类具有一定的参考意义.

     

    Abstract: Different forests show various spectral characteristics because of the differences in canopy structure and functional traits.Analysis of spectral characteristics during different forests can provide a basis for high precision forest classification and canopy parameter inversion.Therefore,a clear understandingof the hyperspectral characteristics of typical forest types in China isuseful toimprove the accuracy of forest classification and forest physical and chemical parametersinversion.Four typical forest sites (Changbai Mountain,Shennongjia,Qianyanzhou and Dinghushan) of Chinese Ecosystem Research Network (CERN) have been studied.The reflectance spectrum curves of four kinds of forests have been extracted in pixel scales from EO-1 Hyperion images.First-order differential has been employed to reduce noise from spectral data and some indexes have been calculated to quantitatively analyze its spectral characteristics.The results show that firstly,the reflectance of broadleaved mixed forest at Shennongjia is significantly higher than that of the other three forest types in the whole spectral range.Coniferous mixed forest at Qianyanzhou shows a low reflectance.Changbai Mountain and Dinghushan forests own medium reflectivity.Secondly there are significant differences in the red edge slope during the four forest types.The red edge slope of Shennongjia forest is the highest,suggesting that its canopy chlorophyll content is the highest and the best health.Compared with the other three type forests,the red edge position of Qianyanzhou forest had red-shift and its red edge is located at 720nm.In addition,according to remote sensing indexes,Normalized Difference Nitrogen Index (NDNI) of broadleaved mixed forest at Shennongjia is larger than that of coniferous mixed forest at Qianyanzhou,which reflects the difference of leaf nitrogen concentration between them.In addition,due to high forest coverage,Enhanced Vegetation Index (EVI) is likely to indicate accurate changes in forest greenness and coverage than Normalized Difference Vegetation Index (NDVI).This study is very important for remote sensing inversion of forest parameters and high precision forest classification in China.

     

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